Having problems with the "Sport" light (which is supposed to inndicate trans problems) on my '91 Accord Ex. Light comes on, and !st, neutral, and reverse will work. 2nd, D3, & D4 provide second gear only. Pulling the "back-up" fuse resets the computer and problem goes away temporarily. Tried to pull the trouble codes from the ATCU, but the sport light and the check engine light burn continuously (no blinks).

Any suggestions?